WASHINGTON—President Trump’s senior trade adviser, Peter Navarro, excoriated China and attacked Goldman Sachs and Wall Street as Beijing’s “unpaid foreign agents” who are weakening the U.S. leader before his meeting this month with China’s president.

Less than a mile away from where Mr. Navarro spoke, Secretary of State Mike Pompeo and Defense Secretary Jim Mattis met with their Chinese counterparts to try to mend fences with Beijing, while discussing North Korea, Iran, the South China Sea and trade.

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